12256621 has 8 divisors (see below), whose sum is σ = 13449240. Its totient is φ = 11099712.

The previous prime is 12256579. The next prime is 12256633. The reversal of 12256621 is 12665221.

It can be written as a sum of positive squares in 4 ways, for example, as 4247721 + 8008900 = 2061^2 + 2830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12256621 - 2¹³ = 12248429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12256681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8206 + ... + 9583.

It is an arithmetic number, because the mean of its divisors is an integer number (1681155).

Almost surely, 2^12256621 is an apocalyptic number.

It is an amenable number.

12256621 is a deficient number, since it is larger than the sum of its proper divisors (1192619).

12256621 is a wasteful number, since it uses less digits than its factorization.

12256621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17855.

The product of its digits is 1440, while the sum is 25.

The square root of 12256621 is about 3500.9457293709. The cubic root of 12256621 is about 230.5633386855.

The spelling of 12256621 in words is "twelve million, two hundred fifty-six thousand, six hundred twenty-one".